I can lie, but I cannot speak. People use me to welcome and clean.

Pronounced as one letter, and written with three, two letters there are, and two only of me. I’m double, I’m single, I’m green blue, brown and gray, I’m read from both ends, and the same either way.

I play in the waves with flippers and zeal, I press down the wax to close the deal. One swims with grace, one shuts things tight, Name the word that does both right

I am a musical instrument of two words. The first may sound like I'm showing off, but it's actually quite descriptive!

I resemble a suction cup, but I do not suck. You can prevent flooding with me.